170320993 has 2 divisors, whose sum is σ = 170320994. Its totient is φ = 170320992.

The previous prime is 170320981. The next prime is 170321017. The reversal of 170320993 is 399023071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159971904 + 10349089 = 12648^2 + 3217^2 .

It is an emirp because it is prime and its reverse (399023071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170320993 - 2⁵ = 170320961 is a prime.

It is not a weakly prime, because it can be changed into another prime (170320963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85160496 + 85160497.

It is an arithmetic number, because the mean of its divisors is an integer number (85160497).

Almost surely, 2^170320993 is an apocalyptic number.

It is an amenable number.

170320993 is a deficient number, since it is larger than the sum of its proper divisors (1).

170320993 is an equidigital number, since it uses as much as digits as its factorization.

170320993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 170320993 is about 13050.7085248273. The cubic root of 170320993 is about 554.3142714608.

The spelling of 170320993 in words is "one hundred seventy million, three hundred twenty thousand, nine hundred ninety-three".